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onsemi 1N5942BRL
- Part No.:
- 1N5942BRL
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N5942BRL.pdf
- Description:
- DIODE ZENER 51V 3W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,270
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Product details
Overview
1N5942BRL from onsemi is a 3 W, 51 V ±5% Zener diode in DO-41 (Case 59) axial package, designed for precision voltage regulation and transient suppression in power supply feedback loops, overvoltage clamping, and reference circuits. It delivers 38.8 mA maximum DC zener current, 7.3 Ω dynamic impedance at 70 mA test current, and supports surge power up to 98 W for 1 ms.
For engineers reviewing the 1N5942BRL datasheet, pinout, applications, or equivalent options, key selection criteria include its 51 V nominal Zener voltage, ±5% tolerance, 3 W steady-state dissipation at 75°C lead temperature, low leakage (<0.25 μA at 38.8 V), and Pb-free tape-and-reel packaging (6000 units/reel).
Technical Context
This device uses silicon-oxide passivated junction technology to achieve stable Zener breakdown with low noise and high reliability across −65°C to +200°C operating range. Its 3 W power rating is maintained at TL = 75°C with 3/8″ lead length, derating linearly above that temperature.
The 1N5942BRL exhibits 7.3 Ω Zener impedance at IZT = 70 mA and 1100 Ω at IZK = 0.25 mA, enabling tight regulation under both nominal and low-current conditions. Reverse leakage remains ≤0.25 μA at VR = 38.8 V, supporting low-power standby modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 48.45 V min / 51 V nominal / 53.55 V max at IZT = 70 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 3 W at TL = 75°C (3/8″ leads) - sets maximum continuous thermal load without derating |
| Zener Impedance (ZZT) | 7.3 Ω at IZT = 70 mA - determines AC regulation error under dynamic load changes |
| Max DC Zener Current (IZM) | 29 mA - derived from PD/VZ; limits safe continuous conduction without exceeding thermal limits |
| Reverse Leakage (IR) | ≤0.25 μA at VR = 38.8 V - ensures minimal quiescent current in high-impedance bias networks |
| Surge Power Rating | 98 W for 1 ms - enables robust transient suppression during short-duration overvoltage events |
| ESD Rating | Class 3 (>16 kV HBM) - provides inherent protection against handling-induced electrostatic discharge |
Pinout & Package
DO-41 (Case 59) axial-leaded plastic package with cathode indicated by a painted band. Dimensions: A = 4.10–5.20 mm (length), B = 2.00–2.70 mm (diameter), D = 0.71–0.86 mm (lead diameter), K = 25.4 mm (lead length). Mounting position is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener breakdown anode terminal | Connected to higher potential node; reverse-biased operation establishes regulated voltage drop from cathode to anode |
| Anode | Zener breakdown cathode terminal | Reference ground or lower-potential node; current flows into cathode and out of anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Guarantees tight regulation window (48.45–53.55 V) without post-manufacturing trimming |
| 3 W power rating in DO-41 footprint | Delivers 3× the power of conventional 1 W Zeners without increasing board space |
| Silicon-oxide passivated junction | Ensures long-term stability and low parameter drift under thermal cycling and humidity stress |
| Pb-free tape-and-reel packaging | Enables automated SMT-compatible placement with 6000 units per reel and RoHS compliance |
| 98 W surge capability (1 ms) | Withstands brief line transients common in industrial power supplies without degradation |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Precision voltage reference establishing error amplifier setpoint. Use Value: 51 V nominal Zener voltage enables direct sensing of 12 V–24 V outputs using resistive divider; ±5% tolerance ensures consistent regulation across production lots. |
Use Scenario: Protects downstream ICs from input rail surges in 48 V telecom systems. IC Role / Device Role / Timing Role: Shunt clamping element diverting excess energy to ground during transients. Use Value: 98 W surge rating absorbs 1 ms spikes up to 100 V without failure; low leakage preserves system efficiency in standby mode. |
| Industrial Sensor Reference | Programmable Logic Controller Input Protection |
Use Scenario: Provides stable excitation voltage for 4–20 mA current-loop pressure sensors. IC Role / Device Role / Timing Role: Low-drift voltage reference source for analog front-end circuitry. Use Value: Silicon-oxide passivation minimizes long-term drift; 7.3 Ω ZZT ensures <10 mV regulation error under sensor load variations. |
Use Scenario: Clamps induced ESD and lightning-induced surges on digital I/O lines of PLC modules. IC Role / Device Role / Timing Role: Primary shunt protection device absorbing fast-rising transients before TVS activation. Use Value: Class 3 ESD rating (>16 kV HBM) handles repeated human-handling events; axial DO-41 form factor allows easy field replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5942B | Same electrical specs but in bulk (2000/unit box) vs. tape-and-reel; identical DO-41 package and marking | No difference in circuit function or layout; differs only in packaging format and quantity | Select 1N5942B for manual prototyping or low-volume assembly where reel handling is impractical |
| MMSZ5254B-TP | Surface-mount SOD-123 package; 51 V ±5%, 500 mW rating; higher ZZT (17 Ω) and lower IZM (10 mA) | Not suitable for 3 W continuous dissipation; limited to low-power bias/reference roles in compact layouts | Choose MMSZ5254B-TP only when board space constraints prohibit axial components and thermal load is <0.5 W |
Compared with 1N5942BRL, the 1N5942B offers identical performance in bulk packaging for lab use, while MMSZ5254B-TP trades power capability for miniaturization-making it viable only in low-dissipation SMT designs where 1N5942BRL's 3 W rating is unnecessary.
Availability
1N5942BRL is available at Aetrix Electronics and suitable for industrial power supplies, telecom surge protection, sensor reference circuits, and programmable logic controller input stages requiring stable component supply and full traceability.
Supply support for 1N5942BRL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, signal conditioning, and discrete devices for automotive, industrial, and cloud infrastructure markets.
The 1N59xxB series was engineered to deliver high-reliability, high-power Zener regulation in legacy-compatible axial packages-targeting cost-sensitive, thermally demanding applications where surface-mount alternatives lack sufficient power handling.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5942BRL?
The 1N5942BRL has a nominal Zener voltage of 51 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 48.45 V and 53.55 V when measured at IZT = 70 mA and TL = 30°C. This tolerance is guaranteed by onsemi and applies across the full operating temperature range of −65°C to +200°C.
How does the 1N5942BRL differ from the 1N5942B variant?
The 1N5942BRL and 1N5942B share identical electrical specifications, package (DO-41), and marking. The only difference is packaging format: 1N5942BRL is supplied in tape-and-reel (6000 units/reel) for automated assembly, while 1N5942B comes in bulk boxes (2000 units/box) for manual handling or low-volume use. Both are Pb-free and fully interchangeable electrically.
What is the maximum continuous power dissipation for the 1N5942BRL?
The 1N5942BRL is rated for 3 W steady-state power dissipation at a lead temperature (TL) of 75°C with 3/8″ lead length. Above 75°C, it derates linearly at 24 mW/°C. At ambient temperature (TA) = 50°C, the rating drops to 1 W with derating of 6.67 mW/°C-critical for thermal design in enclosed enclosures or high-temperature environments.
Can the 1N5942BRL be used for transient voltage suppression?
Yes-the 1N5942BRL supports a nonrepetitive surge power of 98 W for 1 ms, making it suitable for clamping short-duration transients such as EFT bursts or inductive switching spikes. However, it is not a dedicated TVS diode; for sustained or repetitive surges, pairing with a faster-acting TVS or adding series impedance is recommended to avoid thermal overload.
What is the Zener impedance of the 1N5942BRL and why does it matter?
The 1N5942BRL has a maximum Zener impedance (ZZT) of 7.3 Ω at IZT = 70 mA. This value quantifies how much the output voltage varies with changes in current-lower ZZT means tighter regulation. In practice, this enables <±50 mV variation for ±350 mA load steps, critical for precision feedback and reference applications where stability is paramount.
1N5942BRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 38.8 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N5942BRL FAQ
1.How can I place an order for 1N5942BRL through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5942BRL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1N5942BRL reliable?
The price and inventory of 1N5942BRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5942BRL is usually 5 days.
3.What payment methods are accepted for 1N5942BRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5942BRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5942BRL?
1N5942BRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5942BRL order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1N5942BRL?
For technical support, including 1N5942BRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5942BRL requirements.
6.How does Aetrix verify that 1N5942BRL is sourced from the original manufacturer or authorized distributors?
All 1N5942BRL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1N5942BRL meets industry standards.
7.What is the process for return or replacement of 1N5942BRL?
All 1N5942BRL units undergo pre-shipment inspection (PSI). If there is an issue with 1N5942BRL, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1N5942BRL part is unused and in its original packaging.
Return procedure for 1N5942BRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5942BRL Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
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SMAZ12-13-F
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